backstory vs impression

backstory

noun
  • A fictitious account of a person's history designed to conceal their actual history and motives. 

  • The previous life and experiences of a person, especially a character in a dramatic work, but also a real-life person. 

  • A prequel. 

impression

noun
  • A vague recalling of an event, a belief. 

  • set of copies of a publication printed at one time having the same content, layout, pagination, etc. 

  • The vivid perception of something as it is experienced, in contrast to ideas or thoughts drawn from memory or the imagination. 

  • The indentation or depression made by the pressure of one object on or into another. 

  • An online advertising performance metric representing an instance where an ad is shown once. 

  • An outward appearance. 

  • A print on paper from a wood block, metal plate, etc. 

  • An impersonation, an imitation of the mannerisms of another individual. 

  • The first coat of colour, such as the priming in house-painting etc. 

  • The overall effect of something, e.g., on a person. 

verb
  • To manipulate a blank key within a lock so as to mark it with impressions of the shape of the lock, which facilitates creation of a duplicate key. 

How often have the words backstory and impression occurred in a corpus of books? (source: Google Ngram Viewer )